Sealing compound



ATTORNEYS June l1, 1929; A. w. scHoRGER sx-:ALING coMPoUND Filed oct. 1. 1927 Patented June 1l, 1929.

UNITED-'STATES PATENT orifice.

ABLIE W. SOHORGER, F MADISON, WISCONSIN, ASSIGNR, BY MESNE ASSIGNMENTS,

T0 BUBGESS BATTERY C0., OF MADISON, WISCONSIN, A. CDRPORATION 013' WIS- OONSDT.

saam-NG comrounn.

Application filed October 1, 1927.V Serial No. 223,332.

My invention relates to the composition of a sealing compound having an asphalt base and especially suitable for certain types of dry cells.

5 Itis an object of my invention to compound a'fusible sealing material having an asphaltic base which has a relatively high melting point but which i's rubber-y and elastic at room temperatures and sticks tenaciously to the ma terials which are to be sealed.

In the accompanying dravvings I have shown the sealing compound used in connection with a battery of the ilat type.v In this showing,

Fig. 1 is a perspective vievs7 of a flat cell;

Fig. 2 is a cross sectional view of a cell, and,

Fig. 3 is a cross sectional view of a plurality' of cells assembled in a container to form a battery. i

In the dry cell industry and especially in the manufacture of dry batteries composed of flat cells, it is necessary to use a sealing material having peculiar properties to secure the best results with the batteries. A dry battery of Hat cells is made up'of successive layers of sheet zinc 1, bibulous liners 2, fiat depolarizing mix cakes 3, and flat carbons 4, held under pressure by tape or other suitable binding material. This battery of cells usually is then sealed by enclosing it in a paper A box 5 and pouring a fusible seal 6 over it to completely encase it. The fusible seal contacts with the edge portions of the carbon and zinc electrodes and with the retaining box. When the battery is in operation and often during temperature changes, there is a tendency for a breathing action similar to that of a bellows. This act1on`is probably due to the generation or expansion of gases in the depolarizing mixture resulting from the reactions occurring therein and also because of temperature changes vunder such conditions a hard fusible seal of no elasticity will, crack and break whereas a rubbery compoundf deforms Without cracking. The compound must lnot permanently deform under these conditions but should be elastic so that it rea'ins its shape after the pressure is relieved y leakage. The compound must also have a vdry batteries consist comparatively high melting point (about 100 C.) so that the seal does not ilovv if the battery is used or is stored or shipped in a hot location as in a freight car on a hot day in summer. Furthermore'the compound must be tacky enough to cause it to adhere tightly -to the projecting portions of the zinc and carbon electrodes and to the container.

I have discovered that ii Montan Wax is added in limited amount to an asphaltic maso terial, the resulting mixture has the desirable properties enumerated above. Iiinseed oil is usually added to the mixture. .It has been usual to add paratn to asphalt to soften it for the above purpose but paraiiin and ase5 phalt are not entirely miscible and a homogeneous mixture is not obtained. The mixture has a short consistency. On the other hand, Montan Wax, which is a true Wax eX- tracted'from German brown coal, is entirely 70 soluble in asphalt and gives it a tough rubbery consistency at ordinary temperatures.

f an asphalt With a softening point of about 117 C. is used, 80 parts of this asphalt is blended with 10 parts of Montan wax and 75 l0 parts of linseed oil to form a rubbery compound having a melting point of about 94C? C. By decreasin the Montan Wax or linseed oil content, the so tening point is raised. If it is desirable' (as for high summer temso peratures) to have a compound having a melting point of about 110 C., 82.5 parts of the 117 C. asphalt is blended with 15.5 parts of l Montan Wax and 2.00 parts of linseed oil. The linseed oil may be omitted entirely. The proportions given are illustrative and may be varied to suit any special requirement. With an asphalt melting at 117 C. it is desirable to have at least 7 5 percent of that compound present.

The composition may be employed for other purposes in which a material` having such properties is desirable, and the disclosure of its use in connection with a flat cell is merely illustrative. 95

I claim: Y 1. An elastic sealing compound for use in essentially of an asphaltic material and ontan Wax.

2. An elastic sealing compound for" use in dry batteries consisting essentially of asphalt, 4. Anblastic sealing compound for use in Montan aX and linseed oil. dry batteries consisting essentially of 80 to' 3. An e astio sealing compound for use in 82.5 parts of asphalt melting at about 117 10 dry batteries consisting essentially of at least C., 10 to v15.5 parts of Montan wax and 2 to i 75 percent of an asphalt melting at about 117 10 parts linseed oil.

C., the balance-consisting of Montan wax and In testimony whereof I ailix my signature. linseed oil. ARLIE W. SCHORGER. 

